<template>      
    <div class="person">
        <h1>情况三：监视【reactive】定义的对象类型数据</h1>
        <h2>姓名:{{ person.name }}</h2>
        <h2>年龄:{{ person.age }}</h2>
        <button @click="changeName">修改名字</button>
        <button @click="changeAge">修改年龄</button>
        <button @click="changePerson">修改整个人</button>
    </div>
</template>

<script lang="ts"  setup >
    import {reactive,watch} from 'vue'
    
    let person = reactive({
        name:'张三',
        age:18
    })

    function changeName()
    {
        person.name += '~'
    }
    
    function changeAge()
    {
        person.age +=1
    }
    
    function changePerson(){
        Object.assign(person,{name:'李四',age:90})
    }
    //监视  情况三：监视reactive定义的对象类型数据，且默认开启深度监视。
    watch(person,(newValue,oldValue)=>{
        console.log('person变化了',newValue,oldValue)
    })
</script> 